The Absorption and Distribution of Radioactive Phosphorus in Two Maize Inbreds and Their Hybrid

Rabideau, Glenn S.; Whaley, W. Gordon; Heimsch, Charles

doi:10.2307/2437961

Cited by 21 publications

(9 citation statements)

References 16 publications

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“…The amount of p32 varied in different leaves, generally increasing from the 4th to 9th leaves and decreasing in the 1Oth and 11th leaves. Similar results were reported by Rabideau et al for maize grown in solution cultures ( 11) . The activities for the other 3 treatments were lower.…”

Section: Uptake and Distribution Of P 32 In 1961 Studiessupporting

confidence: 92%

Principles of Nutrient Uptake from Fertilizer Bands. VII. P32 Uptake by Brace Roots of Maize and Its Distribution Within the Leaves¹

Robertson¹,

Kang²,

Ramirez-Paz³

et al. 1966

Agronomy Journal

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The influence on phosphorus uptake of area of roots in the fertilized soil and the rate of fertilization was investigated using aerial brace roots of maize. Either 1 or 2 brace roots were directed into soil containing 0.62 or 3.10 g of phosphorus labeled with P32. The radioactivity of the tip and/or basal portions of all leaves was measured by wrapping one thickness of leaf around a long G–M tube. The distribution of P32 in several leaves was mapped with an end window G–M tube. The P32 accumulation measured by the in‐situ technique was highly correlated with that of the standard briquet method. Phosphorus uptake varied with the rate of fertilization and the number of fed brace roots. The proportion of total phosphorus derived from the fertilizer ranged from 1–37%. The P32 distribution in the leaves depended upon their position relative to the fertilized brace roots. The leaves on the brace root side had higher P32 activity in their tip portions than in their basal portions. This distribution is explained by limited connections between vascular bundles of the stem and the diverging of the leaf veins from the midrib.

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Section: Uptake and Distribution Of P 32 In 1961 Studiessupporting

confidence: 92%

Principles of Nutrient Uptake from Fertilizer Bands. VII. P32 Uptake by Brace Roots of Maize and Its Distribution Within the Leaves¹

Robertson¹,

Kang²,

Ramirez-Paz³

et al. 1966

Agronomy Journal

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“…The results of studies on corn inbreds and hybrids in our own laboratory (Whaley, 1950) seem representative of the general findings. Among some ten inbred lines there occurred a great deal of variation from one line to another as to both embryo weight and seed weight.…”

Section: Seed and Embryo Developmentsupporting

confidence: 74%

“…Its development was definitely not a characteristic of the later growth phases. This observation has now been made for many cases of hybrid vigor (Whaley, 1950). There are some instances in which hybrid vigor seems to be the result of longer-continued growth on the part of the hybrid.…”

Section: Early Seedling Growth and Heterosismentioning

confidence: 76%

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Heterosis: A Record of Researches Directed Toward Explaining and Utilizing the Vigor of Hybrids

Gowen¹

1952

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CONWAY ZIRKLEexception. Practically all of its factual background was reported before Mendel's great contribution was discovered. Even workable methods for utilizing hybrid vigor in crop production were known, but it was not until the classic post-Mendelian investigations of Shull, East, and Jones were completed, that heterosis took its proper place in genetics. The following discussion of the importance of heterosis will be confined to its pre-Mendelian background.Heterosis can be described as a special instance of the general principles involved in inbreeding and outbreeding. To fit it into its proper niche, we will trace first the evolution of our ideas on the effects of these two contrasting types of mating. Since our earliest breeding records seem limited to those of human beings and primitive deities, we will start with the breeding records of these two forms.Hybrid vigor has been recognized in a great many plants during the last two hundred years. We will therefore describe briefly what was known of its influence on these plants. Because heterosis has reached its greatest development in Zea mays, we will trace briefly the pre-Mendelian genetics of this plant, and show how the facts were discovered which have been of such great scientific and economic importance.The ill effects of too-close inbreeding have been known for a long time.Indeed, Charles Darwin (1868) believed that natural selection had produced in us an instinct against incest, and was effective in developing this instinct because of the greater survival value of the more vigorous offspring of exogamous matings. One of his contemporaries, Tylor (1865), noted that many savage tribes had tabooed the marriage of near relatives, and he assumed that they had done so because they had noticed the ill effects of inbreeding. The Greeks looked upon certain marriages between near relatives as crimes. This has been known almost universally ever since Freud popularized the tragedy of King Oedipus. At present, we outlaw close inbreeding in man, and our custom is scientifically sound.We are apt to be mistaken, however, if we read into the standards of our distant preceptors the factual knowledge which we have today. The intellectual ancestors of European civilization approved of inbreeding and actually practiced it on supposedly eugenic grounds. The fact that their genetics was unsound and their eugenic notions impractical is irrelevant.They had their ideals, they were conscientious and they did their duties. The Pharaohs married their own sisters when possible so that their godlike blood would not be diluted. Marriage between half brother and sister was common in other royal families of the period. Actually, as we shall see, the two great pillars of European thought, Hebrew morality and Greek philosophy, endorsed inbreeding as a matter-of-course.The Hebrews, who derived mankind from a single pair, were compelled to assume that the first men born had to marry their sisters-as there were EARLY IDEAS ON INBREEDING AND CROSSBREEDING 3 then no other women on the e...

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“…It simply means that species has more branch root system and may explore its soil efficiently [23][24] . On the other, difference in mineral storage also may be due to genetically controlled mechanisms of mineral nutrition in terms of absorption and translocation of particular elements 25 .…”

Section: Fruit and Vegetables Rich In Iron And Vitamins Especially A mentioning

confidence: 99%

Untitled

2011

IJPSR

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Amaranthus vegetable and seeds are highly nutritious. Four species of Amaranthus were planted in pots in a glass house and leaves were harvested. Fresh leaves were analyzed for protein and carbohydrate content and oven dried leaves for Fe, Ca, K and Na contents. Protein content was varied from 6.10-9.00g/100g of fresh leaves. The amount of carbohydrate in fresh leaves of all four species varied from 9.75g-21.29g. Among the species, A. spinosus showed higher amount (21.29g) which is almost two folds higher than A. tricolor (9.75g). Results showed that A. viridis had higher accumulation (54mg). Overall K amount in the dry leaves of the four species varied between 2230-3900mg per 100 g of dry leaves and it was almost 2 fold differences between values of lowest and highest accumulation. The variation in amount of Ca was 38 fold higher, A. spinosus from the minimum amount (A. blitum). Fe content in dry leaves was maximum in A. viridis (15mg per 100g of dry wt) followed by A. spinosus (13.28mg), A. tricolor (10mg) and A. blitum (9mg). Wild species had more amount of Fe than cultivated species. The results of this study indicate a nutritive potential for the Amaranthus leaves, therefore, domestication of this plant is suggested along with assessment of its chemical and nutritional properties.

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The Absorption and Distribution of Radioactive Phosphorus in Two Maize Inbreds and Their Hybrid

Cited by 21 publications

References 16 publications

Principles of Nutrient Uptake from Fertilizer Bands. VII. P32 Uptake by Brace Roots of Maize and Its Distribution Within the Leaves¹

Principles of Nutrient Uptake from Fertilizer Bands. VII. P32 Uptake by Brace Roots of Maize and Its Distribution Within the Leaves¹

Heterosis: A Record of Researches Directed Toward Explaining and Utilizing the Vigor of Hybrids

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The Absorption and Distribution of Radioactive Phosphorus in Two Maize Inbreds and Their Hybrid

Cited by 21 publications

References 16 publications

Principles of Nutrient Uptake from Fertilizer Bands. VII. P32 Uptake by Brace Roots of Maize and Its Distribution Within the Leaves1

Principles of Nutrient Uptake from Fertilizer Bands. VII. P32 Uptake by Brace Roots of Maize and Its Distribution Within the Leaves1

Heterosis: A Record of Researches Directed Toward Explaining and Utilizing the Vigor of Hybrids

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Principles of Nutrient Uptake from Fertilizer Bands. VII. P32 Uptake by Brace Roots of Maize and Its Distribution Within the Leaves¹

Principles of Nutrient Uptake from Fertilizer Bands. VII. P32 Uptake by Brace Roots of Maize and Its Distribution Within the Leaves¹